Outlet connection for pulp-digesters.



No. 832,935. PATENTED OUT. 9, 19016.

G. S. VAN VOORHIS.

OUTLET CONNECTION FOR PULP DIGBSTERS. APPLICATION FILED SEPT. 5. 1905.

l l i UNITED STATES PATENT OFFICE.

GEORGE S. VAN VOORHIS, OF BELFAST, MAINE. ASSIGNOR TO DUPLEX ROLLER BUSHING COMPANY, OF BELFAST, MAINE, A CORPORATION OF MAINE.

Specification of Letters Patent.

Patented Oct. 9, 1906.

Application filed September 5, 1905. Serial No. 276,924.

To aZZ whom it may concern:

'Be it known that I, GEORGE S. VAN VooR- HIS, of Belfast, in the county of Waldo and State of Maine, have invented certain new and useful Improvements in Outlet Connecttions for PulpDigesters, of which the following is a specification.

This invention relates to digesters for preparing paper-pulp; and it consists in the connection to be placed at the outlet of a digester for conducting the pulp away therefrom, which has provision also for admitting steam to cook the pulp. Its object is to provide such a connection of a form such as to cause the outflowing pulp to be diverted and is so shaped as to prevent lodgment o1 brick, cement, and other matter which may fall from the digester-lining at any part of its interior. Formerly such substances had to be taken out at great inconvenience and expense through a hand-hole situated at the back of the T, which this invention entirely does away with, owing to its lack of such pockets and the arrangement of the steam-inlets. In addition to these features of construction, it also has openings, with integral provisions for the attachment of steam-pipes, to permit live steam being blown into the interior of the digester through the improved outlet.

Figure 1 represents an elevation, and Fig. 2 a central section, on a reduced scale, of a device embodying the present invention.

Referring to the drawings, Fig. 2, the char actor (1 represents in dotted lines the lower part of a pulp-digester, which may be of any usual construction, the bottom of which is open and forms at b an outlet gfor discharging the cooked pulp.

c is the connection forming the subject of the present invention, which is adapted to be attached to the bottom of the digester in line with the outlet 1) and may be secured in any way, as by flanges d, which may be bolted to flanges e of the digester. This connection 0 is an elbow form, with an inlet f and outlet g, which are directed at right angles to each other, whereby the stream of outflowing pulp when discharged from the digester may be deflected into a suitable receptacle at one side. The interior oi the connection, as will be seen, is formed as a continuous passage with smoothly-curved sides, so that no angles or abrupt pockets are left in which foreign substances-such as brick, mortar, &c. may lodge. Hitherto it has been customary to provide T connections for conducting away the pulp; but such connections have the objectionable sharp-angled interior pockets in which the foreign substances above referred to are certain to lodge. The connec tion 0 also has passages h and 11 opening from its interior through its lower and outer walls and being in line with the inlet f and outlet g, respectively, of the connection. Thus the axis of the passage h extended passes through the center of the inlet f, while the passage '2, is similarly arranged with respect to the outlet 9. Surrounding the passages h and i are nipples faced off and surrounded at their ends by flanges h i, to which may be bolted tapped and flanged connections is l for furnishing means of attachment thereto of steam-admission pipes. When live steam is admitted through the passage 71, the outlet g being then closed, it is permitted to blow through the openings 7 of the connection and b of the digester into the interior of the latter, where it cooks the material to be made into pulp. After the cooking process is completed the flow of steam is shut off and the outlet 9 opened, which permits the pulp to flow through the elbow c to whatever receptacle may be connected thereto, while the sornothly-curved interior of the elbow permits the pulp to be deflected laterally and to flow without eddying or being obstructed.

What I claim is 1. A connection for pulp-digesters hav ng a smoothly-curved interior passage leading from the outlet of the digester and a passage opening into the connection adapted to admit steam.

2. A connection for pulp-digesters havmg a smoothly-curved interior passage arranged with its inlet and outlet portions extending substantially at right angles, and having a steam-admission opening in line with the inlet.

3. A connection for pulp-digesters having a smoothly-curved interior passage arranged with its inlet and outlet portions extending substantially at right angles, and having passages in line with its inlet and outlet, respectively, adapted to admit steam.

4. An elbow connection adapted to be mounted adjacent the outlet of a pulp-digester and having a smoothly-curved interadjacent the digester-outlet and having a smoothly-curved internal passage leading to a discharge-opening, substantially at right angles to the inlet, said connection also having passages through its sides axially in line respectively with digester-outlet and the discharge-opening of the connection and adapted to serve as steam-inlets.

In testimony whereof I have affixed my signature in presence of two witnesses.

GEORGE S. VAN VOORHIS.

Witnesses:

E. A. ALLEN, P. W. PEZZETTI. 

